18.3. Performing a health check using a Containerfile

Procedure

1. Create a Containerfile:

   $ cat Containerfile
   FROM registry.access.redhat.com/ubi10/httpd-24
   EXPOSE 8080
   HEALTHCHECK CMD curl http://localhost:8080 || exit 1

   注意

   The HEALTHCHECK instruction is supported only for the docker image format. For the oci image format, the instruction is ignored.

2. Build the container and add an image name:

   $ podman build --format=docker -t hc-container .
   STEP 1/3: FROM registry.access.redhat.com/ubi10/httpd-24
   STEP 2/3: EXPOSE 8080
   --> 5aea97430fd
   STEP 3/3: HEALTHCHECK CMD curl http://localhost:8080 || exit 1
   COMMIT health-check
   Successfully tagged localhost/health-check:latest
   a680c6919fe6bf1a79219a1b3d6216550d5a8f83570c36d0dadfee1bb74b924e

3. Run the container:

   $ podman run -dt --name=hc-container localhost/hc-container

4. Check the health status of the hc-container container:

   • Using the podman inspect command:

     $ podman inspect --format='{{json .State.Health.Status}}' hc-container
     healthy

   • Using the podman ps command:

     $ podman ps
     CONTAINER ID  IMAGE                 COMMAND               CREATED      STATUS          PORTS       NAMES
     a680c6919fe  localhost/hc-container:latest  /usr/bin/run-http...  2 minutes ago  Up 2 minutes (healthy) hc-container

   • Using the podman healthcheck run command:

     $ podman healthcheck run hc-container
     healthy

     For more information, see podman-healthcheck(1) and podman-run(1) man pages on your system.